Though he says he has not made up his mind whether he will vote for Democrat Hillary Clinton, Weber said the world would be "all in shambles" under a Trump presidency.

He was critical of Trump's protectionist trade policy, and says he is concerned the Republican Party may not survive if Trump is heading it.

Former House Speaker Newt Gingrich, with whom Weber worked during his 12 years in Congress, said on Wednesday that Trump's recent unforced errors on the campaign trail, including criticizing Gold Star parents Khizr and Ghazala Khan, who attacked him at the Democratic National Convention, were "self-destructive."